s3 will not boot up to the user interface mode

I am trying to dowload photos to my computer, but it will not boot up to the appropriate stage in order to dowload photos. Phone seems to be stuck in a boot loop. it will start to boot up and then randomly shut off at different stages. Sometimes it gets to the at&t logo, while other times it may get to the samsung galaxy sIII image, etc. i tried going to the recovery mode, and not sure which option to choose, then an error at the bottom appears and saying invalid data error. Is there any way to fix this?
I am trying to recover old info/pics that are on the phone
thanks

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